fissure
🇺🇸
/ˈfɪʃər/
🇬🇧
/ˈfɪʃə(r)/
A crack or a split, especially in rock or the ground.
The fissure in the rock wall was so deep that it seemed to go on forever.
岩の壁の亀裂がとても深くて、永遠に続くようだった。